MAX4373TEUA+

Overview

The MAX4373TEUA+ is a low-cost, micropower high-side current-sense supervisor integrating a current-sense amplifier, bandgap reference, and latching comparator. It operates from a single +2.7V to +28V supply with a typical supply current of 50µA. The device features a +20V/V gain, a 0V to +28V common-mode input range independent of supply voltage, and an operating temperature range of -40°C to +85°C. It is housed in an 8-pin µMAX package.

Feature Summary

• Integrates a high-side current-sense amplifier, internal bandgap reference, and a latching comparator output to prevent oscillation during overcurrent events.
• Features a 0V to +28V common-mode input range that remains functional even when the supply voltage drops to zero, ensuring monitoring capability during deep battery discharge.
• Provides a fixed voltage output proportional to the sense resistor voltage, eliminating the need for external gain-setting resistors.

Applications

• Notebook Computers
• Portable/Battery-Powered Systems
• Smart Battery Packs/Chargers
• Cell Phones
• Power-Management Systems

Procurement Notes

Verify the specific suffix 'TEUA+' corresponds to the 8-pin µMAX package with +20V/V gain and lead-free/RoHS compliance as documented in the official Analog Devices ordering information. Confirm the manufacturer source is Analog Devices Inc. or Maxim Integrated. Ensure the component meets the specified -40°C to +85°C extended temperature range requirements for your application environment.

Selection Notes

Select this part for applications requiring high-side current monitoring where ground path interference must be avoided. The +20V/V gain is suitable for larger sense resistors or lower current ranges compared to higher gain variants. Verify that the system supply voltage stays within the 2.7V to 28V range and that the output voltage does not exceed the internal clamp limits for the selected gain configuration.

Part Context

This component belongs to the MAX4373/MAX4374/MAX4375 family of low-cost, micropower current-sense supervisors. While the MAX4373 provides a single latching comparator, the MAX4374 and MAX4375 variants include an additional comparator for window detection functions. All variants share similar electrical characteristics but differ in pin count and comparator availability.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the +20V/V gain, 8-pin µMAX package, and high-side sensing capabilities with other Analog Devices current-sense amplifiers.

FAQ

How does the MAX4373 handle overcurrent conditions?

The device uses a latching comparator output that shuts down the power supply without oscillating. The latch can be reset by pulsing the RESET pin low for at least 1.5µs.

What is the function of the CIN1 pin?

CIN1 serves as the positive input for the internal comparator. When the voltage at CIN1 rises above the internal 600mV reference, the comparator output latches into the open state.

Can the MAX4373 monitor battery current during deep discharge?

Yes, the 0V to +28V common-mode input range is independent of the supply voltage, allowing current monitoring even when the battery pack is in deep discharge and the supply voltage is near zero.